Reaction kinetics of cassava starch graft anionic nonionic type polymer internal curing agents

  • Rongjin Liu College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P.R.C. Civil and Environmental Engineering Department, University of Louisville, Louisville, KY 40292, U.S.A. Ministry-province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guilin 541004, P.R.C.
  • ZhiHui Sun Civil and Environmental Engineering Department, University of Louisville, Louisville, KY 40292, U.S.A.
  • Weiheng Xiang College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P.R.C.
  • Ping Chen College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P.R.C. Ministry-province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guilin 541004, P.R.C.
  • Ruizhe Zhou College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P.R.C.
Keywords: free radical polymerization, graft reaction rate, kinetics, growth sigmoid curve, internal curing agent

Abstract

Internal curing can help to improve the durability of concrete by preventing and minimizing initial cracks due to autogenous shrinkage and plastic shrinkage. Using a reliable internal curing agent is essential to the effectiveness of the internal curing process. This paper investigates the reaction kinetics of a starch graft anionic nonionic type polymer. The results demonstrate that initiator monomer concentration, and starch concentration are positively correlated with graft reaction rate Rp. Based on the research, the kinetics equation of this cassava starch graft anionic nonionic-type polymer has also been developed, which coincides well with the law of free radical polymerization. The obtained Rp equation is a first order dependence of the monomer concentration and the square root of the initiator concentration. And Rp is further correlated to the reaction temperature based on a sigmoid function instead of a linear function. It is also found that the polymerization reaction is characterized by the coexisted disproportion termination and coupling termination.

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Published
2019-01-11
How to Cite
Liu, R., Sun, Z., Xiang, W., Chen, P., & Zhou, R. (2019). Reaction kinetics of cassava starch graft anionic nonionic type polymer internal curing agents. Journal of Building Materials and Structures, 5(2), 185-196. https://doi.org/10.34118/jbms.v5i2.57
Section
Original Articles